I like the idea. I definitely think there is a need for a site like this because the news no longer comes even close to cutting it when it comes to presenting "both sides of the coin."

There are a couple of things I would like to point out that you may already realize:

1) It is extremely important that for something like this to succeed you must concentrate on keeping the level of discourse as high as possible, not unlike HN. The minute I see someone posting "you're an idiot" without an actual argument that's going to turn me off.

2) I'm not a big fan of the two goals you have listed on the home page- "stand up for what you believe and meet like minded people." The reason I say this is because when I come to a site to learn about a political or social issue, I come to not only express my opinion but learn about others as well. "Without fully understanding your opponents argument, you can't fully understand your own." My goal is probably not going to be to find like minded people as that is who I have surrounded myself with on a day to day basis for the most part.

Great idea though and good luck to you.